a genuine article mk18 barrel is 10.3"
so why are there all these 11" and 12" variants? who was the original intended clientele? is this sort of like the advent of mid length gas system? something that just works better but wasn’t made for anyone specific?
Are you referencing anything in particular? In terms of commercially available uppers, many choose them for increased velocity and reliability due to much longer dwell time. I personally favor the 12" as a do-all length
Sent from my HTC One using Tapatalk
nothing in particular. just wondering how they came about, what the evolution’s purpose was.
I believe the 11.5 predates the 10.3.
I run 11.5’s and 14.5’s. I hear the dwell time improves reliability but plenty oh plenty of 10.3’s run like a house on fire. BCM doesn’t make anything shorter than 11.5 and I heard thats why. I have two bought two Bravo SBR uppers that both ran perfectly.
Ditto for me, I like shorties, and wanted to get a DD 10.3 (which I am sure work great), but after doing some research and listening to much wiser people than I (Paul from BCM, among others), I decided to go for an 11.5".
Negligibly heavier/longer, with slightly better ballistics, but 40% longer dwell time.
Ended up getting a DD 11.5", and it runs like a raped ape.
10.3" with a closed linear brake like a Troy Claymore or Noveske Pig would seem to make up much of that 40% dwell time.
What velocity difference are we talking about between a 10.3 and 11.5?
Disregard, wrong post.
While adding unnecessary weight and length… and removing the option for mounting a suppressor.
No thanks.
If you added a can, you wouldn’t need such a device anyway.
Not an option in can-free MN. The weight and length is worth it here to throw the blast forward. If I didn’t have so much family here, my retired butt would reside in can land.
I’ve always wondered myself where the 12.5 ever came from.
The 12.5" allowed a bit more velocity especially with Mk262, even allows for some creative M203 Mounting applications (e.g. DD GL/SSC RIS-II) . For a civilian SBR with a good SS barrel, this has all the accuracy and the majority of the reach needed, and with a compact can on it it’s still on par with a 16.1" with muzzle device for length. There are plenty of uses for a 12.5" carbine, and if for whatever reason I could only run one 5.56 weapon system, it would be a 12.5" with a 5" suppressor, A5 RE/buffer, and low powered variable optic.
11.5" is the standard length for a short sbr since the 1960s.
10.3" is the length of a MK18 barrel.
11.5" is superior in almost every aspect to 10.3" if using a full spectrum of commercial and military ammo.
10.3" MK18 were specifically developed to give the shortest possible gun tuned to M193, M855, and Mk262 NATO loads.
Yes, but for running short and running loud, the conservative options are:
It’s clearly advantageous to have the extra barrel vs. a booster.
12.5" is my favorite length… although I admit even indoors I don’t “feel” the difference much between 12.5" and 11.5"… and even less between 10.5" and 11.5".
You’re just giving up velocity and pushing the limits of adequate dwell time.